24v for UMO with HBK

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This is not really new, there are already quite some posts about running the old UMO under 24v.

Just want to share my experience -- if you have the Heated Bed Kit installed it is a very easy hack as the HBK power supply is 24v.

Why would you want to do this?

Because:

My heater cartridge is 24v, so heating with the original 19v can be slow

I have 24v fans (Actually 12v in series)

I have 24v LEDs (id)

I don't know how efficient/powerful the 24 to 19v step down is, but when the printer starts my LEDs are fading, so it is definitely not over-dimensioned

How to do it?

You just need to to bring the 24v from the HBK board to the Ultiboard:

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The original 12v linear converter is not powerful enough and if not already done it needs to be replaced by a switching step-down regulator

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Note: On my old board (1.5.3) the electronics fan is on the regulated 12v, so it is not affected by this hack. But if you have a more recent board (e.g. 1.5.7), the fan is directly connected on Vin, so it will go from 19 to 24v. On these printers, the electronics fan is 24v, so there is no issue, but it will be more noisy

This is obvious, but do not forget to remove the old cable linking the boards!

That's it: enjoy 24v

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I have added a plug on the wires between the 2 boards, so I could easily revert to the old setup (not sure why I would do that, but I liked the idea of having a backup plan )

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